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The type of boundary conditions present are designated by numerals 0, 1, 2,
3, 4, and 5. Types 4 and 5 are less common, used primarily for the Heat
Equation in the 1-D rectangular coordinate system.
The zeroth type of boundary occurs where there is no physical boundary
present. For example, a semi-infinite body with a fixed temperature at *x* = 0
has number designation *X*10. Similarly, the 2-D quarter-infinite body with
type 1 boundaries at *x* = 0 and *y* = 0 is *X*10*Y*10. Finally, the zeroth type
of boundary also occurs at the center of a solid cylinder or a solid sphere.
For example, a solid
cylinder with a prescribed surface heat flux has designation *R*02.

*Kevin D. Cole*

*2003-07-21*